1*0a6a1f1dSLionel Sambuc/* $NetBSD: brk.S,v 1.24 2014/05/23 02:34:19 uebayasi Exp $ */ 22fe8fb19SBen Gras 32fe8fb19SBen Gras/*- 42fe8fb19SBen Gras * Copyright (c) 1990 The Regents of the University of California. 52fe8fb19SBen Gras * All rights reserved. 62fe8fb19SBen Gras * 72fe8fb19SBen Gras * This code is derived from software contributed to Berkeley by 82fe8fb19SBen Gras * William Jolitz. 92fe8fb19SBen Gras * 102fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without 112fe8fb19SBen Gras * modification, are permitted provided that the following conditions 122fe8fb19SBen Gras * are met: 132fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright 142fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer. 152fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright 162fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer in the 172fe8fb19SBen Gras * documentation and/or other materials provided with the distribution. 182fe8fb19SBen Gras * 3. Neither the name of the University nor the names of its contributors 192fe8fb19SBen Gras * may be used to endorse or promote products derived from this software 202fe8fb19SBen Gras * without specific prior written permission. 212fe8fb19SBen Gras * 222fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 232fe8fb19SBen Gras * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 242fe8fb19SBen Gras * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 252fe8fb19SBen Gras * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 262fe8fb19SBen Gras * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 272fe8fb19SBen Gras * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 282fe8fb19SBen Gras * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 292fe8fb19SBen Gras * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 302fe8fb19SBen Gras * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 312fe8fb19SBen Gras * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 322fe8fb19SBen Gras * SUCH DAMAGE. 332fe8fb19SBen Gras * 342fe8fb19SBen Gras * from: @(#)brk.s 5.2 (Berkeley) 12/17/90 352fe8fb19SBen Gras */ 362fe8fb19SBen Gras 372fe8fb19SBen Gras#include <machine/asm.h> 382fe8fb19SBen Gras#if defined(SYSLIBC_SCCS) && !defined(lint) 39*0a6a1f1dSLionel Sambuc RCSID("$NetBSD: brk.S,v 1.24 2014/05/23 02:34:19 uebayasi Exp $") 402fe8fb19SBen Gras#endif /* SYSLIBC_SCCS and not lint */ 412fe8fb19SBen Gras 422fe8fb19SBen Gras#include "SYS.h" 432fe8fb19SBen Gras 442fe8fb19SBen Gras .globl _end 452fe8fb19SBen Gras .globl _C_LABEL(__minbrk) 462fe8fb19SBen Gras .globl CURBRK 472fe8fb19SBen Gras 482fe8fb19SBen Gras#ifdef WEAK_ALIAS 492fe8fb19SBen GrasWEAK_ALIAS(brk, _brk) 502fe8fb19SBen Gras#endif 512fe8fb19SBen Gras 522fe8fb19SBen Gras .data 532fe8fb19SBen Gras_C_LABEL(__minbrk): 542fe8fb19SBen Gras .long _end 552fe8fb19SBen Gras .text 562fe8fb19SBen Gras 572fe8fb19SBen GrasENTRY(_brk) 5884d9c625SLionel Sambuc#ifdef __PIC__ 592fe8fb19SBen Gras movl 4(%esp),%ecx 602fe8fb19SBen Gras PIC_PROLOGUE 612fe8fb19SBen Gras movl PIC_GOT(_C_LABEL(__minbrk)),%edx 622fe8fb19SBen Gras PIC_EPILOGUE 632fe8fb19SBen Gras cmpl %ecx,(%edx) 642fe8fb19SBen Gras jb 1f 652fe8fb19SBen Gras movl (%edx),%ecx 662fe8fb19SBen Gras movl %ecx,4(%esp) 672fe8fb19SBen Gras1: 682fe8fb19SBen Gras OSYSTRAP(break) /* don't clobber %ecx */ 692fe8fb19SBen Gras jc err 702fe8fb19SBen Gras PIC_PROLOGUE 712fe8fb19SBen Gras movl PIC_GOT(CURBRK),%edx # set up GOT addressing 722fe8fb19SBen Gras PIC_EPILOGUE 732fe8fb19SBen Gras movl %ecx,(%edx) 742fe8fb19SBen Gras xorl %eax,%eax 752fe8fb19SBen Gras ret 762fe8fb19SBen Graserr: 77f14fb602SLionel Sambuc jmp CERROR 782fe8fb19SBen Gras#else 792fe8fb19SBen Gras movl 4(%esp),%ecx 802fe8fb19SBen Gras cmpl %ecx,_C_LABEL(__minbrk) 812fe8fb19SBen Gras jb 1f 822fe8fb19SBen Gras movl _C_LABEL(__minbrk),%ecx 832fe8fb19SBen Gras movl %ecx,4(%esp) 842fe8fb19SBen Gras1: 852fe8fb19SBen Gras OSYSTRAP(break) /* don't clobber %ecx */ 862fe8fb19SBen Gras jc err 872fe8fb19SBen Gras movl %ecx,CURBRK 882fe8fb19SBen Gras xorl %eax,%eax 892fe8fb19SBen Gras ret 902fe8fb19SBen Graserr: 912fe8fb19SBen Gras jmp CERROR 922fe8fb19SBen Gras#endif 93*0a6a1f1dSLionel SambucEND(_brk) 94